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Oracle 1z0-809 Exam Dumps

Exam Name: Java SE 8 Programmer II
Certification Name: Java SE

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  • Total Questions: 196
  • Last Updation Date: 16-Apr-2024

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Which statement is true about the single abstract method of the java.util.function.Function
interface?

 

It accepts one argument and returns void.

 

It accepts one argument and returns boolean.

 

It accepts one argument and always produces a result of the same type as the
argument.

 

It accepts an argument and produces a result of any data type


It accepts one argument and always produces a result of the same type as the
argument.


Reference: http://winterbe.com/posts/2014/03/16/java-8-tutorial/ (functions)





The data.doc, data.txt and data.xml files are accessible and contain text.
Given the code fragment:
Stream<Path> paths = Stream.of (Paths. get(“data.doc”),
Paths. get(“data.txt”),
Paths. get(“data.xml”));
paths.filter(s-> s.toString().endWith(“txt”)).forEach(
s -> {
try {
Files.readAllLines(s)
.stream()
.forEach(System.out::println); //line n1
} catch (IOException e) {
System.out.println(“Exception”);
}
}
);
What is the result?

 

The program prints the content of data.txt file.

 

The program prints:
Exception
<<The content of the data.txt file>>
Exception

 

A compilation error occurs at line n1.

 

The program prints the content of the three files.


The program prints the content of the three files.






Given the code fragment:
public static void main (String[] args) throws IOException {
BufferedReader brCopy = null;
try (BufferedReader br = new BufferedReader (new FileReader(“employee.txt”))) { //
line n1
br.lines().forEach(c -> System.out.println(c));
brCopy = br;//line n2
}
brCopy.ready(); //line n3;
}
Assume that the ready method of the BufferedReader, when called on a closed
BufferedReader, throws an exception, and employee.txt is accessible and contains valid
text.
What is the result?

 

A compilation error occurs at line n3.

 

A compilation error occurs at line n1.

 

A compilation error occurs at line n2.

 

The code prints the content of the employee.txt file and throws an exception at line n3.


A compilation error occurs at line n1.




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